Big discussion from another URL <a href="https://news.ycombinator.com/item?id=40194636">https://news.ycombinator.com/item?id=40194636</a> (405 points | 18 hours ago | 177 comments)
what does it mean for a nucleus to be in a higher energy state? is there any macro phenomenon that is related to it? when it drops back down, it gives off a gamma ray or something?